$OpenBSD: patch-bootstrap_sh,v 1.7 2017/02/14 12:31:38 sthen Exp $
--- bootstrap.sh.orig	Mon Feb 13 19:51:51 2017
+++ bootstrap.sh	Mon Feb 13 22:27:04 2017
@@ -18,8 +18,8 @@ case `uname -sr` in
 		MY_AM_VER=19
 		;;
 	OpenBSD*)
-		export AUTOCONF_VERSION=2.63
-		export AUTOMAKE_VERSION=1.9
+		[ -z "$AUTOCONF_VERSION" ] && export AUTOCONF_VERSION=2.63
+		[ -z "$AUTOMAKE_VERSION" ] && export AUTOMAKE_VERSION=1.9
 		;;
 	*'BSD'*)
 		MY_AC_VER=-2.62
